QuakeIndex

Earthquake · reviewed by a seismologist

M 3.0ml

22 km S of San Pedro, CA

· 2.2 km deep · released about 990 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Orange County 46 kmLos Angeles County 73 km
Distance rings around the epicentre, with the nearest towns at their true direction and later quakes as coloured dots. Not a shaking map — see the USGS ShakeMap for that.
When
Magnitude
M 3.0 (ml)
Depth
2.2 km below the surface
Felt
no reports yet
Measured shaking
intensity I (ShakeMap)
Nearest
Orange County, 46 km ENE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 359 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.

How big was it?

This earthquake released about 990 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.0 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 340,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 15,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 11,000× the energy of this one
  4. This earthquake M 3.0 about 990 lb of TNT

Energy from the Gutenberg–Richter relation (log10E = 1.5M + 4.8), rounded to two figures; bar length is magnitude, which is already a logarithm of energy. Magnitudes of past earthquakes from the USGS catalogue.

Where

Epicentre 33.5443, -118.2508. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Orange County, CA 46 km (29 mi) WSW of here earthquakes near Orange County
Los Angeles County, CA 73 km (45 mi) S of here earthquakes near Los Angeles County
Ventura County, CA 122 km (76 mi) SE of here earthquakes near Ventura County

Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.

Aftershocks so far

44 earthquakes have been recorded within 50 km since this one.

  1. 2.0 3 km WSW of Hermosa Beach, CA
  2. 1.6 15 km WSW of Dana Point, CA
  3. 1.6 2 km E of Carson, CA
  4. 1.5 0 km NE of Paramount, CA
  5. 2.0 3 km SSE of Lomita, CA
  6. 1.7 3 km S of Baldwin Hills, CA
  7. 1.8 2 km N of San Joaquin Hills, CA
  8. 2.3 3 km SSW of Baldwin Hills, CA
  9. 1.6 3 km SSW of Baldwin Hills, CA
  10. 1.6 3 km SSW of Baldwin Hills, CA
  11. 2.2 17 km S of San Pedro, CA
  12. 1.5 2 km NW of Costa Mesa, CA
  13. 1.8 21 km SSE of San Pedro, CA
  14. 2.0 19 km WSW of Manhattan Beach, CA
  15. 1.9 28 km SSE of Malibu, CA

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of . QuakeIndex does not forecast aftershocks. When USGS issues an operational aftershock forecast it appears on the USGS event page.

For this area

The largest earthquake within 50 km in our catalogue was M 4.3 on 2021-09-18 — it released about 80 times the energy of this one.

From the QuakeIndex catalogue, built from the USGS FDSN event service.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.